Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Patrick O'Neill, MD

Cytopathology Physician in Terre Haute, IN · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1922118900

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Registry record

Entity type Individual (Type 1)

Name William Patrick O'Neill

Credential MD

Sex Male

Practice address 3901 S 7th St, Terre Haute, IN, 47802

Phone (812) 234-8261

Fax (812) 234-8262

Enumeration date Aug 30, 2006

Last updated in NPPES Apr 15, 2026

Taxonomy & licenses

207ZP0101X Anatomic Pathology Physician Allopathic & Osteopathic Physicians · License 25MA12983000 (NJ) Secondary

207ZC0500X Cytopathology Physician Allopathic & Osteopathic Physicians · License 25MA12983000 (NJ) Primary

207ZP0101X Anatomic Pathology Physician Allopathic & Osteopathic Physicians · License 01061109A (IN) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

What is the NPI number for William O'Neill?

The National Provider Identifier (NPI) for William O'Neill is 1922118900, a Type 1 (individual) record in the CMS NPPES registry.

Where does William O'Neill practice?

The practice location on file with NPPES is in Terre Haute, IN. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-04-15.